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Per Document image requests are pooled. If the same URL ends up in this pool it is directly retrieved from disc. No HTTP cache semantics are coming in between. I am told this is a pretty hard compatibility constraint. 1. Fetch does not have concept of a per-Document request pool. 2. We should investigate whether to do this only for images or for all requests.
This is implemented as the "list of available images" in HTML.
CSS and SVG would have to make use of that too then, but I suppose that could work if we do not introduce a "fetch group" concept of sorts for Document objects.
Seems better for a higher layer to handle this. *** This bug has been marked as a duplicate of bug 24055 ***